板式楼梯中，考虑到斜板的刚度较小，当其两端与平台梁整体相连时，由于支座对斜板的嵌固影响，故跨中弯矩可近似取为。（）
参考答案：对
民主性是国家的根本属性。 [ ]
I can't imagine how he finished the relay race, ______ his foot wounded so seriously.[ ]
A. as
B. for
C. with
D. because of
。（）
。（）